feat: add turbopack support for Next.js v15#44
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Ethan-Arrowood merged 2 commits intoMay 6, 2026
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Replace the `webpack: boolean` plugin option with a `bundler` option that accepts "webpack" or "turbopack". The default is version-aware: - v16: turbopack (matches Next.js v16 default) - v15: webpack (matches Next.js v15 default) - v14: webpack (no turbopack support) Users can now explicitly set `bundler: turbopack` for v15 to opt in, or `bundler: webpack` for v16 to opt out. - Add `next-15-turbopack` fixture and integration test - Update `next-16-webpack` fixture to use `bundler: webpack` Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Next.js v14 does not support turbopack via the createServer or nextBuild APIs. Log an error and fall back to webpack if a user sets `bundler: turbopack` with a v14 application. Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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* feat: add turbopack support for Next.js v16 Next.js v16 defaults to Turbopack. The plugin previously hardcoded webpack for both build and serve, disabling turbopack entirely. - Add `webpack` boolean plugin option (defaults to false) so users can opt into webpack when needed, mirroring the `next build --webpack` CLI flag - Update `withHarper()` to include a `turbopack` config key, preventing Next.js v16 from erroring when it sees a webpack config without one - Add `next-16-webpack` fixture and integration test to cover both bundler paths Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * add allowImportingTsExtensions for integration testing tsconfig * feat: add turbopack support for Next.js v15 (#44) * feat: add turbopack support for Next.js v15 and refactor bundler option Replace the `webpack: boolean` plugin option with a `bundler` option that accepts "webpack" or "turbopack". The default is version-aware: - v16: turbopack (matches Next.js v16 default) - v15: webpack (matches Next.js v15 default) - v14: webpack (no turbopack support) Users can now explicitly set `bundler: turbopack` for v15 to opt in, or `bundler: webpack` for v16 to opt out. - Add `next-15-turbopack` fixture and integration test - Update `next-16-webpack` fixture to use `bundler: webpack` Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: add v14 turbopack guard and validate all versions (#45) Next.js v14 does not support turbopack via the createServer or nextBuild APIs. Log an error and fall back to webpack if a user sets `bundler: turbopack` with a v14 application. Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * docs: document bundler option in README Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
webpack: booleanplugin option (from feat: add turbopack support for Next.js v16 #43) into abundleroption that accepts"webpack"or"turbopack"with version-aware defaults:turbopack(matches Next.js v16 default)webpack(matches Next.js v15 default)webpack(no turbopack support)bundler: turbopackfor v15 to opt into turbopack, orbundler: webpackfor v16 to stay on webpackturbopack: falsefrom v15 build and serve pathsnext-15-turbopackfixture and integration testTest plan
npm run build— TypeScript compiles cleannext-15.pw.ts— webpack (default): 3/3 passednext-15-turbopack.pw.ts— turbopack (explicitbundler: turbopack): 3/3 passednext-16.pw.ts— turbopack (default): 3/3 passednext-16-webpack.pw.ts— webpack (explicitbundler: webpack): 3/3 passed🤖 Generated with Claude Code